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Each dragon has an ability. It can be used to defend themselves, travel or even destroy unnecessary hazards. In the Book of Dragons, Hiccup described that if you need to train a dragon, you have to know dragons the same as knowing their abilities or more data. In the series, most dragon trainers use their dragon's abilities to do their work; they use their dragon's abilities to create a statue of Thor and even help Mildew with his gardening. In every film known the Snaptrapper and the Timberjack are the only dragons not shown to demonstrate their ability. The Changewing is the only known dragon to have the most abilities: Hypnotism, Acid Breath and Camouflage. Each dragon has similar abilities to a dragon from their dragon class, as it was described by Gobber the Belch.